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Ar

Argon

#18 · Noble Gas

Mass39.948 u
Density0.0017837 g/cm³
Melting83.8 K
Boiling87.3 K
Ionization Energy1520.6 kJ/mol
Atomic Radius71.0 pm
Blockp-block
State (RT)Gas
Config[Ne] 3s2 3p6
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